For conventional PV panels, we can assume that their impulse withstand voltage UW is higher than the inverter's UW. In this case, we recommend installing the SPD as close as possible to the inverter. This only applies when the distance between the inverter and the PV modules is less than 10 m. Otherwise, it is necessary to install two SPDs on both sides of the DC line, ie both at the inverter and at the PV modules. As to the DC side, the condition of the inverter's distance from the main switchboard applies to the AC side. If the inverter is installed in the distance less than 10 m of cable line from the main switchboard, it is sufficient to install the SPD only in the main switchboard, where it is always installed, unless the risk management calculation specifies otherwise. If the distance is longer, the SPD shall also be installed as close as possible to the inverter.

The type of SPD we install is determined by two conditions. The first is whether the building has an external lightning protection system (LPS). In other words, if it has a lightning rod. The second condition is the compliance with the separation distance "s" between the supporting structure of the PV modules or between the modules themselves and the air termination system.

The selection of the SPD continuous operating voltage (UC) on the DC side is derived from the no-load voltage value of the PV generator under standard test conditions (UOC STC). The minimum UC value shall be greater than or equal to 1,2 times of the UOC STC value.

Hakel has introduced a new range of G-line surge arresters for PV installations to complement its core range. It offers both SPDs type T2 and T1+T2 in both U and Y connection for all LPL levels, ie for all possible applications. All that for voltage levels from 600 V DC to 1 500 V DC. In addition, they guarantee zero discharge or leakage currents in the Y connection, which can trigger the reaction of insulation monitoring device, which every IT power supply system must be equipped with.

It is also important to note that in today's world of modern information technologies, there are devices in these applications that need to be protected by special surge protection devices for the transmission of data and information signals. Find out more in the Data protection product catalog.

The PV system diagram consists of two parts - the AC side and the DC side. There is an inverter between these parts, which is the center piece of the system and its function is to convert the DC power generated by the PV modules into AC power that can be supplied to the distribution system or consumed as part of an autonomous system. The standard HD 60364-7-712:2016 requires the installation of surge protection devices on both the DC and AC side. The EN 50539-12 or the new EN 61643-32 standard helps us to choose the right type of surge protection device.

For conventional PV panels, we can assume that their impulse withstand voltage UW is higher than the inverter's UW. In this case, we recommend installing the SPD as close as possible to the inverter. This only applies when the distance between the inverter and the PV modules is less than 10 m. Otherwise, it is necessary to install two SPDs on both sides of the DC line, ie both at the inverter and at the PV modules. As on the DC side, the condition of the inverter's distance from the main switchboard applies on the AC side. If the inverter is installed in the distance less than 10 m of cable line from the main switchboard, it is sufficient to install the SPD only in the main switchboard, where it is always installed, unless the risk management calculation specifies otherwise. If the distance is longer, the SPD shall also be installed as close as possible to the inverter.

The type of SPD we install is determined by two conditions. The first is whether the building has an external lightning protection system (LPS). In other words, if it has a lightning rod. The second condition is the compliance with the separation distance "s" between the supporting structure of the PV modules or between the modules themselves and the air termination system.

The selection of the SPD continuous operating voltage (UC) on the DC side is derived from the no-load voltage value of the PV generator under standard test conditions (UOC STC). The minimum UC value shall be greater than or equal to 1,2 times of the UOC STC value.

Hakel has introduced a new range of G-line surge arresters for PV installations to complement its core range. It offers both SPDs type T2 and T1+T2 in both U and Y connection for all LPL levels, ie for all possible applications. All that for voltage levels from 600 V DC to 1 500 V DC. In addition, they guarantee zero discharge or leakage currents in the Y connection, which can trigger the reaction of insulation monitoring device, which every IT power supply system must be equipped with.

It is also important to note that in today's world of modern information technologies, there are devices in these applications that need to be protected by special surge protection devices for the transmission of data and information signals. Find out more in the Data protection product catalog.